Electric-arc lamp



2 SheetsSheet 1.

(No Model.)

0.. HEISLER.

ELECTRIC ARC LAMP.

No. 263,404. Patented Aug. 29, 1882.

INVENTORZ ATTESTZ N4 PETERS. Pnam-Lnhn mr. washmghm. DV 0 2 Sheets--Sheet 2.

(No Model.)

C. HEISLER.

ELEUTRIU ARC LAMP. No. 263,404. Patnted Aug. 29, 1882.

ATTESTI INVENTORY N. PETERS. Fhuln-Lnhngraphcr. whnm PATENT OFFICE.

CHARLES HEISLER', OF ST. LOUIS, MISSOURI.

ELECTRIC- SPECIFICATION forming part of Letters ARC LAMP.

Patent No. 263,404, dated August 29, 1882.

Application filed March 28, 1881. (No model.)

To all whom. it may concern:

Be it known that I, CHARLES HEISLER, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

This invention consists in the provision, in an electric lampof the arc type, of two or more sets of carbon electrodes,the holders of which are connected together and moved in common by an operating electro magnet or magnets, when said holders have their lower ends arranged at varying distances apart, so that when the first set of carbons are consumed the next set will come into action before the holders of the first set can come togetherand form a metallic connection for the passage of the current, as will hereinafter more fully appear.

In the drawings, Figure l is a side view of an electric lamp having an upper and lower electro-inagnet for operating the upper-electrode holder. Fig. 2 is a similar view with a single electromagnet for accomplishing the same result. Fig. 3 is a horizontal section taken through the clcctro-magnet, illustrating the arrangement in a circle of the carbon-holders, &c., of a single electric lamp having three sets of carbon electrodes; and Fig. 4 is a side view, illustrating the arrangement of said holders in a straight line.

Referring to the drawings, A represents the upper and B the lower carbon electrode holder, which are tubular in shape so as to receive the carbon pencils or electrodes at I). These electrodes are prevented from being forced bodily out of their holders by detainingfingers a Z), which embrace the conical ends usual to said electrodes, and permit only the cone portion to project, as clearly indicated in the drawings. These fingers or stops may be of any suitable form, and in their construction platina or other refractory material may be used. Near its upper end the holderA is provided with a surrounding annular armaturecore, 0, of the operating axial electro-inagnet (J, by means of which the upper electrode is lifted so as to separate the points and form the light-arc when the lamp is first started, and retain them in such separated position during the operation of the lamp. This electro-magnetalsoacts toadjustthesaidpoints tolengthen or shorten the voltaic arc, in order to compensate for the varying resistance and intensity of the current, and thus insure a steady and even light.

In use a single electro-magnet, G, placed in the lamp-circuit may be used, as indicated in Fig. 2, or an electromagnet O similarly placed in said circuit with an electro-inagnet, G, placed in a branch or shunt portion of the main circuit, as indicated in Fig. 2. The action of the magnet G is to draw the electrodeholder A down when the attraction of the magnet 0 decreases, owing to an increase in the resistance due to an increased length of the light-arc between the points of the electrodes. \Vhere the two electrodes 0 O are used a single core-armature, 0, may be used for both; or, if preferred, a separate armature may be provided for each electro-magnet.

D is a counterbalance weight and lever, which is used to partly or wholly balance the weight of the moving electrode and holder Ac.

d are guide-rollers for guiding the holder A in proper axial line with the lower holder.

The retarding device for preventing a too sudden downward movement of the carbonholder consists of an annular cylinder, E, secured to the supporting frame or casingof the machine and tilled with glycerine or other suitable body, the annular pistou c of this cylinder being connected to the electrode-holder A, as-indicated in Fig. 1.

In order to counteract the irregular action of the electro-magnet caused by the decreasing weight of the carbon electrode as it becomes consumed, I have provided a compensating device as follows, the action of which is to add weight corresponding to that lost by the consumption ot'the electrode: Itconsists of a chain,f, balanced overapulley, F, and connected to the electrode, so that the downward movement of said electrode as it is consumed will draw said chain over the pulleyand add a weight on top of the electrode corresponding to the amount of carbon consumed, the weight of a given length of chain being equal toagiven length of the carbon electrode.

In carrying out this part of my invention various mechanical equivalent devices to that described, and which will readily suggest themselves to those skilled in the art, may be used instead without departing from the spirit of my invention, which is broadly for a compensating device to compensate for the gradual decrease'in the weight of acarbon electrodeby use.

In a great many situations it is desirable to provide a lamp that, when one set of electrodes are consumed or the electric are between the same broken, will automatically bring a succeeding set of electrodes into connection to reestablish the voltaic arc and continue the lighting. In order to attain this object I make use of the following construction and arrangement; of parts: The sets of electrodes and holders are grouped together either in a circular direction, as indicated in Fig. 3, or in a straight line, asindicated in Fig. 4,and are so connected together as to be moved in common by the operating electro-magnet O. The fingers or stops a a a I) b b of the different sets are arranged at slightly varying distances apart, as indicated in Fig. 4. In this figure both sets of fingers are shown as varying from a horizontal line; yetit is evidentthat such variation may be made solely in either the upper orlower set, as desired or foundconvenient. This construction insures the following results: The electric light will be established first between the first or nearest set of electhe arrangement or position of the fingers or stops being such that the electric arc will be established between the last set before the fingers of the first set come together to form metallic connection for the passage of the current. The lower electrodes, 1), are moved upwaidly by a spiral spring, G, or any other suitable mechanism found convenient or desirable.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

In an electric lamp, two or more electrodeholders, said holders moved in common by an electro magnet or magnets, and having their ends projectingvariously toward acorresponding set of opposing holders, as and for the purpose set fortln In testimony of my invention, witness my hand this 24th dayot' March, 18Sl,at St. Louis, in the State of Missouri.

CHAS. HEISLER. In presence of- I THEODORE PAPIN, RUDOLPH HIEZEL. 

